This episode examines the mysterious Tunguska Event of June 30, 1908, when a massive explosion flattened over 2,000 square kilometers of Siberian forest. Witnesses described a fiery object in the sky followed by shockwaves felt around the world—yet no crater was ever found. The most accepted explanation is a meteor or comet airburst, but alternative theories include natural gas eruptions, antimatter or black holes, and even alien spacecraft. Soviet expeditions decades later found widespread destruction but no conclusive evidence. The Tunguska Event remains the largest impact-like explosion in recorded history—its cause still debated, its power a reminder of Earth’s vulnerability to the cosmos.